Roast chicken soup

Ingredients

• 1 tbsp olive oil
• 2 onion, chopped
• 3 medium carrot, chopped
• 1 tbsp thyme leaves, roughly chopped
• 1.4l chicken stock
• 300g leftover roast chicken, shredded and skin removed
• 200g frozen pea
• 3 tbsp Greek yogurt
• 1 garlic clove, crushed
• squeeze lemon juice